Pneumatic tire
a technology of pneumatic tires and treads, which is applied in the direction of non-skid devices, vehicle components, transportation and packaging, etc., can solve the problems of reducing the drainage performance of the outboard tread portion, and achieve the effect of maintaining drainage performance, improving steering stability and uneven wear resistan
Active Publication Date: 2015-09-01
SUMITOMO RUBBER IND LTD
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- Description
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- Application Information
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Benefits of technology
[0006]The present invention has been worked out in light of the circumstances described above, and has a main object of providing a
Problems solved by technology
However, when the land ratio in the outboard tread portion is too large, the drainage pe
Method used
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A pneumatic tire comprises: a tread portion with an inboard and an outboard tread edges; a pair of inboard and outboard center main grooves to define a center portion therebetween; a pair of inboard and outboard shoulder main grooves; an inboard middle portion between the inboard center and shoulder main grooves; an outboard middle portion between the outboard center and shoulder main grooves; an inboard shoulder portion defined the axially outside of the inboard shoulder main groove; an outboard shoulder portion defined the axially outside of the outboard shoulder main groove; the outboard shoulder main groove with a groove width smaller than those of other main grooves; the outboard middle portion having a width larger than that of the inboard middle portion; and a plurality of outboard shoulder lateral grooves each extending from the outboard tread edge to its inner end terminating on the outboard middle portion.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a pneumatic tire in which the steering stability and uneven wear resistance can be improved while maintaining the drainage performance.[0003]2. Description of the Related Art[0004]In order to improve the steering stability and uneven wear resistance, a pneumatic tire having a tread portion with high rigidity by increasing its land ratio is proposed. Especially, as for the pneumatic tire having an installing direction to a vehicle, it is profitable to increase the land ratio in the outboard tread portion which is applied large side force at cornering.[0005]However, when the land ratio in the outboard tread portion is too large, the drainage performance in the outboard tread portion tends to decrease due to small volume of grooves. Accordingly, there is still room for improvement in the method described above.SUMMARY OF THE INVENTION[0006]The present invention has been worked out in light ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B60C11/11B60C11/12B60C11/03B60C11/13
CPCB60C11/0306B60C11/1369B60C11/032B60C11/0304B60C2011/0348B60C2011/0353B60C2011/0369B60C2011/0388B60C2011/0372B60C2011/0381B60C11/01B60C11/03B60C11/04B60C11/13B60C11/12
Inventor HADA, YOSHIHIRO
Owner SUMITOMO RUBBER IND LTD